You need to determine your "system" for your application and ESD equipment, but it is not difficult. Use the "circuit schematic" approach. Consider the current constant monitor systems based on the wrist strap monitor, mat, and benchtop dissipation (and this is not my area of expertise). It is based on a measuring device that is placed in series with the grounding banana plug on the operator's wrist strap. If the operator plugs into the banana jack connector, I believe she closes the circuit and the monitor measures the resistance through the wrist strap to earth ground. If it is within a certain range (something like 1x10^6 to 1 x 10^9 which is considered to be the dissipative range) the monitor likes this, smiles indulgently upon you like her favorite child, and is silent.
But if the monitor measures above or below the dissipative range, it beeps and outgasses a whole bunch of bad karma and looks upon you like her red-headed stepchild, which keeps you away from ESD product. It is disruptive in the workplace; your peers and colleagues stop what they are doing and look at you like you did something in an elevator that was both offensive and politically incorrect and I'm not talking about an NFL player.
If a constant monitor beeps deep in the forest but nobody is around to hear it except you, was there really a sound? Of course not.
Ok, so now you have to come up with the same "electrical image" using an operator standing on a mat, with and without a wrist strap on. I know it can be done. There are systems that can be purchased that monitor both the bench-mats-to-ground and the operator-to-ground simultaneously, but on separate circuits within the same monitor. I also know you can purchase the same type of system based on a floor-mat-to-ground with and without a wrist strap connected. Consult with an expert or look online; you can find them. The cost savings of a good system really does pay for themselves in a year or two, and they are much more reliable than testing but once per day and assuming, by implication, that that operator will continue to be "safely grounded" continuously. Yup, sure. You betcha.
Qualify one or two systems with different operators who have different levels of psoriasis or dry skin or crackly heels and different strains of Oprahtoefungus before you go whole hog and buy 20,000 systems.
Odin
-----Original Message-----
From: Jim West [mailto:[log in to unmask]]
Sent: Thursday, March 05, 2015 2:09 PM
To: TechNet E-Mail Forum; Stadem, Richard D.
Subject: RE: ESD controls
Thanks to those that replied. Some were quite funny and there are some days I wish we could implement a few of those ideas. :-)
Richard,
I'm aware of continuous monitors for wrist straps but not a continuous monitor that would check the ESD shoes and operator connection? What systems are you referring to. You can email me offline if you don't want to get into specific suppliers/products.
Thanks,
Jim
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: Thursday, March 05, 2015 12:15 PM
To: [log in to unmask]
Subject: Re: [TN] ESD controls
Nah.
The solution already exists! The problem is, none of you are using it.
The Constant Monitoring systems used in Tier 4 companies for the wrist straps are easily expanded to ESD flooring in and around the assembly areas where the components are usually outside of their Faraday packaging.
Constant monitors can be set up to go through the operator to the floor ground in the immediate area. So if the operator has a faulty shoe ground OR a faulty wrist strap ground, every time they touch the equipment it checks the resistance and beeps if it is out of range.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Gregg Owens
Sent: Thursday, March 05, 2015 10:37 AM
To: [log in to unmask]
Subject: Re: [TN] ESD controls
I think disabling the machines directly would be hard to setup the software to "talk" between your ESD tester and the machine directly.
An alternate would be to use your ERP system linked to the work order operation for the SMT line to the passing ESD testing. So the technician could not log into the work order operation without first passing ESD testing.
Our ERP system handles the ESD test results and would venture that it would be easier to create software links to the WO operations.
BTW, this is an excellent idea to error-proof your process, especially when escapes are possible. If the is a way to take a shortcut, there always seem to be a will to take shortcuts by some of your staff.
Gregg Owens
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jim West
Sent: Thursday, March 05, 2015 8:06 AM
To: [log in to unmask]
Subject: [TN] ESD controls
All,
Has anyone seen or know of a control system that prevents an operator from running an SMT line if they did not pass or go through an ESD test. (i.e. ESD shoe check)?
Let me give you the scenario we are considering. Operators go through one entrance that requires them to check their ESD compliant shoes and if the test is good, they would walk through a turnstile that is linked to the ESD tester. Our operators have bar- coded badges that would identify them. We also have other entrances/exits to the SMT area that are required for safety reasons. If an operator decides to enter the room without going through the ESD check entrance, once the operators scans their card at the SMT line, the machine (s) would be disabled since they did not pass or go through the ESD check.
If that sounds like a crazy idea, what are other factories doing to ensure every operator has been checked for proper ESD compliancy within ESD controlled zones?
Thanks,
Jim
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